Android bitmap image resource sizes for the different screen pixel densities
Here’s a handy table that you can refer to when creating image bitmap resources for your Android app.
| Qualifier | Approximate dpi | Scaling ratio |
|---|---|---|
| ldpi | 120 | Baseline |
| mdpi | 160 | 4/3 * ldpi |
| hdpi | 240 | 6/4 * mdpi |
| xhdpi | 320 | 8/6 * hdpi |
| xxhdpi | 480 | 12/8 * xhdpi |
| xxxhdpi | 640 | 16/12 * xxhdpi |
| nodpi | N/A | Not scaled |
| tvdpi | 213 | 1.33 * mdpi |
xxxhdpi is only used for launch icons.
Source: Android Developer Guide: Providing Alternative Resources